Natalie Harvey, 19, has brought misery to her hometown of Burnley, Lancashire, with her anti-social and often violent behaviour.
She has 26 convictions in total, and has been banned from many places around the town.
'What's vitally important, it seems to me, in the next two or three months, in your interests, in your child's interests, but more particularly in society's interests, is that there is some stability, some proper medical help and some assistance.'
The teenager already has one child, and is now 31 weeks pregnant with her second. The baby's father is conman Wayne Kinvig, 20, who has already served several jail terms for charity scams.
Judge Simon Newell jailed Harvey for 12 months, stating that the teenager needed 'stability' and that being in custody provided her best chance of having a healthy and happy baby.
Natalie is due to give birth at Styal women's prison in Cheshire in August.
'You have an awfully sad life and background behind you' said the Judge as he sentenced her. 'What's vitally important, it seems to me, in the next two or three months, in your interests, in your child's interests, but more particularly in society's interests, is that there is some stability, some proper medical help and some assistance.'
Her defence lawyer Tim Brennand said Natalie was a 'product of the care system' having been fostered from the age of three, and had been moved and rehoused many times in her youth.